Looper mechanism for sewing-machines.



G. E. MOLYNEUX.'

LOOPER MECHANISM FOR SEWING MACHINES.

APPLICATION FILED JUNE 25, 1913.

1,128,484. Patented 11111. 16,1915.

WITNESSES. l/VI/ETOR gzmq 4 BY A Md m ATTORNEY THE NORRIS PETERS CO.. PHOTO-LITHOHWASHING TON. D. C.

UNTED STATES PATENT OFFICE.

GEORGE E. MOLYNEUX, OF BAYONNE, NEW JERSEY, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

LOOPER MECHANISM FOR- SEWING-MACHINES.

Application filed June 25, 1913.

To all whom it may concern:

Be it known that I, GEORGE E. MOLYNEUX,

. citizen of the United States, residing at Bayonne, in the county of Hudsonand State of New Jersey, have invented certain new and useful Improvements in Looper Mechanism for Sewing-Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to a device for imparting reciprocatory movements to a looper and particularly for producing sidewise jogging or needle-avoiding movements to a chain-stitch looper whose endwise or loop-seizing and shedding movements are communicated to it by other means.

lVhile the present improvement is adapted for embodiment in different types of sewing machines, it is designed more particularly for use in connection with that class of machines provided with a cylinder bed or work-supporting arm having a longitudinally disposed rock-shaft carrying the looper upon its forward extremity and within the outer end of said arm, in which is also journaled a longitudinally arranged shaft from which the looper derives operative movements crosswise of those imparted by its supporting rock-shaft.

The present invention has for its object to provide a simple and effective mechanism whereby axial looper jogging movements may be derived from said shaft.

In the preferred form of the improvement, the looper-carrier is pivotally mounted upon a' transverse pin of the rock-shaft and carries the usual looper whose blade is disposed crosswise of the rock-shaft. Journaled beneath and parallel with the loopersupporting rock-shaft is a rotary shaft having upon its forward extremity a collar provided with a boss slightly inclined to said shaft and having fitted thereon a loose sleeve adapted to partake of the gyratory or nutatory movements of the said boss while being restrained against rotary movement therewith. The sleeve has at one side a ball-socket to receive a ball-stud at one end of a pitman whose opposite end is similarly formed and journaled within a ballsocket of an endwise movable rod mounted within a suitable bearing and having a pivotal and sliding connection with the looper carrier to impart thereto short rocking movements from which are derived the side- Specification of Letters Patent.

Patented Feb. 16, 1915.

Serial No. 775,638.

wise needle-avoiding movement of the looper. Suitable means are provided for oscillating the looper-supporting rock-shaft from which the looper derives its endwise or loop-seizing and shedding movements.

The invention will be understood by reference to the accompanying drawings, in which Figure 1 is a front end elevation of the work-supporting arm of a cylinder-bed sewing machine with the stitch-forming mechanism, and Fig. 2 a side elevation of the same partly in section. Fig. 3 is a plan of the looper-jogging mechanism, looking upwardly. Fig. t is an elevation of the actuating means for the looper-supporting rockshaft. Figs. 5 and 6 are perspective views of portions of the collar containing the nutatory boss, and Fig. 7 a perspective view of the loose sleeve with the cap separated from the body thereof to expose the ballsocket.

The cylinder-bed or work-supporting arm 1 is provided with the throat-plate 2 and the removable end cap 3 housing the looper and its carrier. Mounted axially of the arm 1 in the bearing member 4 thereof, as shown and described more fully in my pending application Serial No. 521,801, filed October 9, 1909, is a longitudinally extending looper rock-shaft 5 having upon its rearward end the crank-arm 6 connected by means of the link 7 with the swinging arm 8 journaled upon the fulcrum-stud 9 which is sustained by a lug 10 upon the inner wall of the frame member 1'. Intermediate its ends the arm 8 is pivotally connected with the lower end of the pitman 11 whose upper end is similarly connected with a lateral arm 12 of a rock-shaft 13 having a second arm 14 to whichis pivotally connected the upper end of the pitman 15 whose lower end is formed with a strap 16 embracing an actuating crank 17 of the rotary shaft 18 journaled in the machine frame and extending longitudinallv of the work-supporting arm 1 thereof.

The looper-supporting rock-shaft has mounted upon its forward end the collar 19 having the reduced portion 20 upon whichis mounted by means of the pivotal pin 21 the transversely apertured looper-carrier 22 in the upper portion of which is secured the looper 23 having its blade disposed transversely of the rock-shaft 5 and arranged for cooperation with the needles '24 secured .in

the clamp- 015 the rectilinearly--reciprocat-' ing needle-bar 26.

The body of the looper-carrier beneath the fulcrum-pin .is.'provided in its lowerportion with a segmental raceway 27 which embraces a split wearing block 28 formed 'with a spherical socket embracingthe head 29 ofa ball stud- 30 whose shank is clamped by means of the screw 31 in a vertical socketin the forwardly projecting arm 32 of a split collar 33 clamped by means of; ascrew 34 upon the reduced forward endof the endwise reciprocating rod or plunger 35 journaled. in the tubular bushing 36 ofthe bearingmember 4 beneath the rock-shaft 5. The rearward portion ofthe rod35 has a removable cap section 37 secured thereto by means of the screw 38 and having intermediate the two parts aball-socket 39013611411 the rearwarden d.

Eixedupon the reduced rearward QIICLOIE' the rotary shaft 18 by means ofthe set-screw 40 istheco'llar 41 having an inclined for- Ward face from-which projects centrally the boss 42 formed with the reduced portion or hub 43 terminating-in the pin 44 all disposed uponan axis slightly inclined to that of the collar and its supporting shaft 18. v A disk 45having a reduced portion or hub 46 and provided-with a central aperture 47 is adapt-- ed ,to beap'plied to the central pin 44 and secured to the hub portion 43 of the collar, 41 by, means of fastening screws 48. The parts 42 andfl45 thus secured together con stitute a: peripherally grooved sectional crank-stud whose axis is inclined to that of said shaft. This crank element has fitted thereon the loose sleeve 49 whose-annular ton'gne 50 is confined within the groove of said, crankTStudand" between the 1 members 42, and45 andsurrounds the sectional hub aflordedby themembers 43 and 46. This sleeve has nutatory movements impartedflto it by the CI'HILkTStHd.

The loosering ,or sleeve 49 has on one side a projection 51 betwee'1'1-which-and the cap 52 isformed the ball-socket ,53 which'is' open at-the forward-face of the sleeveand adapted' to receive 1 one of the spherical ends of the-pitman 54 whose similarly "formed'opposite, end is embraced .by the "ball-socket '39 of the:;rod:351 The: cap a 52- is "secured in "position by means of screws55'and 56, the

outer? extremityiof the latter entering a guiding groove-'57 provided therefor in the innenwa'll ofthe work supporting arm' -1, whereby-rthe sleeve 49 is permitted to perform lateral fmovements": derived from the gyratory or nutator'y crank element or boss while being restrained against rotation therewith by; engagement of'the screw :56 withthe'wall's of the groove 57.

Bygthei'mechanism" above described, edgewiseffmovemerits :are imparted' to-theloopercartien byfi the mperative? movementsot the rock-shaft 5- through the transverse pivotal pin 21', thereby communicating to the looper blade endwis'e loop-seizing and shedding movements; whilethe sidewise or needleavoiding movements are imparted to the looper carrier andlie'nce tothe looper by the described loose connection between the loopr carrier and the rod 35 which in turn derives. its endwise ogging movements from the nutatory movements of the sleeve 49 which are resolvedthrough the agencyof the link or, pitma'n: 54r-into*the,- 'describedrectilinearmovements- It ,is obvious that the present improx ement is-not limited to the present arrangement of parts, nor'tothe specific means herein shown andE described for producing the nutatory movements communicated, in. the form of reciprocatory movements to the looper-carrier,.nor is the specific means of connection between. said nutatory; element and the looper-carrier" essential to the present improvement. 9

Having thus set forth the nature, ofthe invention, what I claim herein is 1. In combination, a looper, acircumnutatorycrank element, and a connection between said looper and circumnutatory crank element, comprising a bodily movable link connected with saidfcranki element at a point remote ,fi om' its center of movement, and; means for confining said "po nt of 1 connection always at the same side of the axis oft movementlof ,saidzcrankielement,

2., In a sewing machine, in combiantion, a shaft, a looper, anon-rotary nutatory ele: ment deriving operative movements from the, endwfise thrust ofsaid shaft, and a link 7 connected at one end to saidmutatoryelement at oneslde OfrltS ax s of 'movement and. at the other end {to said looper.

In a; sewing machine, in combination, a looper, means-'foiwimparting thereto operativ movements in one direction, and means forimpa'rtingto the looper operative movements in adirection crosswise of the firstnamed movement, and. comprising a non-rotary, nutatory .welement mounted upon said shaft}; and a link connected at one end to said gmltatoryelement atone sideof its axisof fmo'vement and-atthe other end'to said :loOPer.

4. In a sewing mac-hine, in combination, a shaft, 3111001381, a crank element mounted upon and having an axisv inclined to. that of said shaft, a non-rotary loose sleeve embracing said crank-element, and a connection between the looper: and said sleeve including .a link having one end-connected with thelatter at a point eccentricv to said crank ,element 5.: Inga sewing: machine, in ;combination,

element and provided with a lateral stud, a fixed guideway embracing said stud, and a link having a connection at one end with said looper and at the opposite end with said sleeve.

6. In a sewing machine, in combination, a shaft, a looper, a crank element disposed upon and in inclined relation with said shaft, a loose sleeve fitted to said crank element and provided at one side with a ball-socket and with rotation restraining means, an endwise movable plunger-rod operatively connected at one end with said looper and having the opposite end formed with a ball-socket, and a link having spherical ends each embraced by one of said ball-sockets.

7. In a sewing machine, in combination, a shaft, a looper, a crank element disposed upon and in inclined relation with said shaft, a loose sleeve fitted to said crank element and provided with a lateral boss and a cap fitted thereto with a divided ball-socket formed between the same, fastening screws for securing said cap in position, one of which projects beyond said cap, a fixed guideway parallel with said shaft and embracing the projecting portion of said fastening screw, an endwise movable plungerrod operatively connected at one end with said looper and having the opposite end formed with a removable section between which and the adjacent portion of said rod is formed a ball-socket, and a link having said ball-sockets.

8. In a sewing machine, in combination, a rock-shaft carrying a transverse fulcrumspherical ends each embraced by one of pin, a rotary shaft parallel therewith, a looper-carrier mounted upon said fulcrumpin and provided with a looper, means for actuating said rock-shaft, an endwise movable plunger-rod parallel with said rock shaft, an operative connection between said plunger-rod and the looper-carrier for imparting to the latter tilting movements upon said fulcrum-pin, a crank element mounted upon and inclined to said rotary shaft, a sleeve embracing and deriving nutatory movements from said crank element and provided with rotation-restraining means, and a link connection between said sleeve and the plunger-rod.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

GEORGE E. MOLYNEUX.

Witnesses:

HENRY J. MILLER, HENRY A. KORNEMANN, Jr.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

